. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . 2 R-2 R) has very little resist-ance. Wire 2R-2 R then short-circuits the 1 R-2R part of f, \t\ ^U B (% ( a) \t\ ^ B (b) 18 ELECTRIC RAILWAYS. 24 the resistance. When the drum is turned another notch,and finger f^ comes into contact, the path of the cur- rent is A-T~f^D^f- R- r^^^y^i^f-^^ R^F-A-F-A. Wire 3 R-3 Rshort-circuits the wholeresistance in R and themotor runs on full fielddirectly across the line,just as it does in Fig-. 8,when 5 touches K. Thiscontroller gives a meansof cut
. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . 2 R-2 R) has very little resist-ance. Wire 2R-2 R then short-circuits the 1 R-2R part of f, \t\ ^U B (% ( a) \t\ ^ B (b) 18 ELECTRIC RAILWAYS. 24 the resistance. When the drum is turned another notch,and finger f^ comes into contact, the path of the cur- rent is A-T~f^D^f- R- r^^^y^i^f-^^ R^F-A-F-A. Wire 3 R-3 Rshort-circuits the wholeresistance in R and themotor runs on full fielddirectly across the line,just as it does in Fig-. 8,when 5 touches K. Thiscontroller gives a meansof cutting out resistance,but the cutting out is notas gradual as where therheostat arm is used. Itis found, however, in prac-tice that three or four re-sistance notches are suf-ficient to give a car asmooth start if the con-troller is handled properly. 15. Fig. 13 shows howan ordinary reversingswitch might be used with a simple controller of this , in modern controllers it is the practice to havethe reversing switch also made in the form of a drum and tomount it in the same case with the power RHBOSTATIC CONTROLLER. 16. General Construction.—Fig. Vo shows a moderntype of rheostatic controller designed by the General Elec-tric Company for the control of cars, haulage locomotives,or hoisting motors. This controller is considered somewhatin detail because it contains many of the features foundon controllers used on street cars and will serve as agood introduction to the study of them. The controller 24 ELECTRIC RAILWAYS. 19 shown in Eit;-. 1:5 is (ksi^md to liandK- one SO-horscpowcr5()()-volt motDT or one •2)-horsc|)o\vci- •.•*0-volt motor, i. c,its contacts arc larg-e enonj^h to handle about 75 fiiivwe sliows the cover J thrown hack so as toexpose the working- parts. This controller is of the viag-nctic bloii-ont type, and is known as a type R controllerbecause it uses rheostatic control. In the General Electric
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectri, bookyear1901
